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Old 09-17-2013, 01:22 AM   #1
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Need help with ticking coming from engine...

Hey guys,

My ride is emitting a ticking sound coming from the engine bay. It sounds like a lifter, but it's really hard to pinpoint the sound. The jeep has 116k on it right now. I don't know if this is a common complaint with the 4.0, I'm just trying to figure out if it's something simple or if I need to break into it and do a valvetrain job.

Also, I'm trying to find a machine shop in the Anchorage area if anyone happens to know of one. Once the winter is over I'd like to give the motor a refresh/stroke... who knows, I might already need a refresh anyway.

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Old 09-17-2013, 07:56 AM   #2
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Pop the valve cover an take a look doesn't take much to unbolt that cover then look at your push rods an rocker arms to at least know you can eliminate them as the problem

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Old 09-17-2013, 08:09 AM   #3
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My '06 sounds more like a Singer sewing machine as the mornings get colder. That sound is fairly normal for a 4.0L motor.

The engine uses a hydraulic tappet/lifter so there really is no lash adjustment to be made. If you had a collapsed lifter, you'd know that right off!
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Old 09-17-2013, 06:06 PM   #4
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Try using a vacuum cleaner hose to isolate the sound. Put one end to your ear and point the other end at stuff. You'll look goofy, but it will work.
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Old 09-17-2013, 06:16 PM   #5
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possible cracked manifold?
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Old 09-18-2013, 04:59 PM   #6
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The 4.0 is known for ticking noises. But might as well locate where it's coming from.
Nother way to locate the sound is using a long screwdriver. Place you ear over the handle end, and touch the other end on various spots around the engine compartment, careful for moving parts.

On ours I found the distributor was the culprit. Had a dry upper bushing. Something not normal for the early versions (ours is a 97) but notorious on the later ones. And it's one of those if you don't catch it early you can easily end up with major damage.
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Old 09-18-2013, 05:35 PM   #7
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Thanks for the input. Once I get home from my deployment I was going to do a thorough tune-up and see if that helps out the ticking at all. I've heard that it could be a cracked exhaust manifold amongst other things. I think I'll use some of the tricks mentioned to try and isolate the sound a little bit better.

I appreciate the help, I'll post an update here in a couple of weeks, hopefully with good news!

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